Composition for flowable fire-resistant materials

A composition suitable for a flowable refractory material, the composition comprising:

• calcium aluminate cement;
• a filler;
• a plasticizer comprising a copolymer comprising a main chain and polyether side chains,
• wherein the polyether side chains of the copolymer are polyether side chains of structural unit (I)
• *-U-(C(O))k—X-(AlkO)z-W (I),
• wherein
• * is a bonding site to the polymer,
• U is a chemical bond or an alkylene group comprising 1 to 8 carbon atoms and optionally substituted by at least one carboxyester, carboxyl, phosphono, sulfino, sulfo, sulfamido, sulfoxy, sulfoalkyloxy, sulfinoalkyloxy, and/or phosphonooxy,
• X is oxygen, sulfur, or NR1,
• k is 0 or 1,
• z is an integer, a mean of which, based on the polymer, is in a range of from 3 to 300,
• Alk is independently C2-C4-alkylene,
• W is H, a C1-C6-alkyl radical, an aryl radical, or Y—F,
• Y is a linear or branched alkylene group comprising 2 to 8 carbon atoms and optionally bearing a phenyl ring,
• F is a nitrogen-bonded 5- to 10-membered nitrogen heterocycle optionally comprising, as ring members, in addition to the nitrogen atom and carbon atoms, 1, 2, or 3 additional oxygen, nitrogen, and/or sulfur, where the nitrogen ring members optionally comprise a group R2, and 1 or 2 carbon ring members optionally form a carbonyl group,
• R1 is H, C1-C4-alkyl, or benzyl, and
• R2 is H, C1-C4-alkyl, or benzyl;
• and
• a retarder comprising an acid.